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Paul Ehrlich is the Bing Professor of Population Studies at Stanford University. He spoke in last night about how population growth impacts our world.

Ehrlich was at the Mahaffey Theatre in St. Petersburg last night to talk about his new book, The Dominant Animal. In it, he describes the rise of human beings to the most dominant species on the planet, and discusses what we can do to reverse the negative impact humanity has had on the planet.

According to Ehrlich, the rise to dominance of the human animal is due to a series of evolutionary traits that range from the days when human ancestors lived in trees to the agricultural revolution, when the first cities were established.

Ehrlich described a way to model the impact of a population on the environment and addressed several of the problems that are caused by the negative impact of populations on the environment.

Ehrlich's lecture concluded a series of Energy and the Environment lectures hosted by USF St. Petersburg and Progress Energy.